Two guys are talking on the street and John says, "Guess how old my three daughters are." Dave is desperate for attention, so he agrees.

John says, "Their ages add to the address of that house," he points across the street, "and their ages multiply to 36."

Dave works on the riddle for a while but eventually he tells John that he can't solve the riddle. John tells Dave that his oldest daughter has red hair. Dave thinks about this, and then he tells John the correct ages of his three daughters.

The riddle is: What are the ages of the three daughters?

That's all the information you need to solve it. Assume that the ages are integers (i.e. no 23-and-a-half stuff).

Here is the answer

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